wypozworski
02.10.2019 •
Mathematics
Astore is having a sale on jelly beans and trail mix. for 8 pounds of jelly beans and 4 pounds of trail mix, the total cost is $21 . for 3 pounds of jelly beans and 2 pounds of trail mix, the total cost is $9 . find the cost for each pound of jelly beans and each pound of trail mix.
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Ответ:
assume jelly beans is J and trail mix is T
8J+4T=21
3J+2T=9
then solve
multiply the first equation by 3 and second equation by 8(SO THE J CAN DISAPPEAR[ELIMINATION METHOD])
24J+12T=63
24J+16T=72
Subtract
-4T=-9
T=0.44
then substitute the T to any one of the equation
3J+2(0.44)=9
3J+0.88=9
3J=8.12
J=2.71
therefore, jelly beans= $2.71 and trail mix=$0.44
Ответ:
3
Step-by-step explanation: